<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <script type="text/javascript">
    function tulin(say) {
      var says = say;
      switch (say) {
        case '土豆':
        console.log('呦');
        break;
          case '呦':
          console.log('切克闹');
          break;
          case '呦':
          console.log('煎饼果子来一套');
          break;
        default:

      }
    }
    tulin('土豆');
      tulin('呦');
        tulin('呦');
    </script>
  </body>
</html>
